System of electrical distribution.



No. 656,650. Patented Aug. 28, I900.

A. D. LUNT SYSTEM OF ELECTRICAL DISTRIBUTION.

(Application filed June 80, 1900.)

(No Model.)

Witnesses Jnventert Alexander D. Lunt WOQM Atty.

UNITED STATES PATENT Clarion,

ALEXANDER D. LUNT, OF SCI-IENECTADY, NEW YORK, ASSIGNOR TO THE GENERALELECTRIC COMPANY, OF NEW YORK.

SYSTEM E LECTRlCAL DISTRIBUTION.

SIEGIFIOATION forming part of Letters Patent No. 656,650, dated August28, 1900.

Application filed June 30, 1900. Serial No. 22,116. (No modell) To allwhom it may concern:

Be it known that I, ALEXANDER D. LUNT, a citizen of the United States,residing at Schenectady, county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Systems of ElectricalDistribution, (Case No. 1,460,) of which the following is aspecification.

My present invention relates to a distribut ing system for alternatingcurrents which, among other features, comprises a means for holding aplurality of alternating-current dynamo-electric machines of a givennumber of phases in displaced-phase relation to each other by operativeconnections to another dynamo-electric machine of a different number ofphases. In a more limited sense my invention renders it possible tosecure the beneficial effects of a multiphase current from single-phasesources by making use of a multiphase receiving apparatus to which arecon nected a plurality of single-phase dynamoelectric machines held indisplaced-phase relation to each other through the reaction of theirelectromotive forces with those generated by said multiphase machines.These, as well as the other features of my invention, will be betterunderstood by reference to the accompanying drawings, taken inconnection with the following description, while the scope of theinvention, both as to its broad and more limited features of novelty,will be apparent by reference to claims appended hereto.

The drawing represents a quarter-phase rotary converter fed fromsingle-phase sources of alternating current. The armature of the rotaryconverter is indicated at l and is provided with a commutator 2, uponwhich bear brushes 3 4, from which lead the direct-current mains 5 6.Any suitable translating devices may be supplied from the direct-currentsystem.

Currentis supplied to the rotary converter from two single phasealternating current generators 7 8. These generators are notmechanically connected to each other, as would be the case, for example,if they were driven upon the same shaft, but are free to adjust theirphase relations with each other. The generator 7 is connectedinductively, through a transformer 9, to leads 10 11, connected topoints in the armature 1 of the rotary converter separated from eachother in this in stance by one-half the polar pitch, or, in other words,one hundred and eighty degrees apart. The generator 8 is similarlyconnected, through a transformer 12, to leads 13 14, also connected topoints in the winding separated from each other to the same extent asthe points of connection of the leads 10 11. The points of connection ofthe leads 13 1st are, however, so arranged as to lie half-way betweenthe points of connection of the leads 1O 11, thereby constituting aquarter-phase connection which corresponds to a four-phase relation ofelectromotive forces in the converter-armature. The diagram represents abipolar converter, but in practice a multiphase construction ispreferable, in which case the number of connections to the armature willbe made to correspond,-as will be evident to one skilled in the art.

In starting up the apparatus the rotary converter should first be thrownin circuit with one of the single-phase sources and after thisconnection has been effected then with the other. By so doing nodifficulty will be found in putting the machines into cooperation witheach other.

The embodiment of my invention which I have above described comprisingsinglephase sources of current cooperating through the instrumentalityof a multiphase receiving-circuit, although a valuable application ofthe principles of my invention is but one of various forms that theinvention may assu me. Thus, for example, instead of the single-phasesource of current I may employ sources having any given number of phasesconnectedthrough the instrumentality of a receiving-circuit of adifferent number of phases. As another example I may employ threephasegenerators to feeda six-phase rotary converter, the generators, as inthe specific case described to illustrate my invention, being free toadjust their phase relations to each other as may be required by reasonof their connection to the six-phase machine. From what has been said itwill be evident that my invention is capable of numerous modificationsand embodiments Without departing from the spirit thereof, for whichreason I do not Wish to be limited to the specific arrangement shown.

Vhat I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. The combination with a plurality of altern ating-current dynamoelectric machines free to adjust their phase relations to each other, ofa synchronous receiving-machine having a number of phases different fromthat of any of the first-mentioned machines.

2. The combination of a plurality of alternating-current generators of agiven number of phases held in displaced-phase relation to each other byoperative connections to a rotary converter of a different number ofphases.

3. The combination of a plurality of alternating-current generators of agiven number of phases, held in displaced-phase relation to each otherby operative connections to a synchronous receiving apparatus of agreater number of phases.

4. The combination of a plurality of singlephase alternatingcurrentgenerators held in displaced-phase relation to each other by operativeconnections to a synchronous receiving apparatus.

5. The combination of a plurality of singlephase alternating-currentgenerators held in displaced-phase relation to each other by operativeconnections to a synchronous receiving apparatus of a greater number ofphases.

6. The combination of a pluralityof singlephase alternating-currentgenerators held in displaced-phase relation to each other by operativeconnections to a quarter-phase synchronous receiving apparatus.

7. The combination of a plurality of singlephase alternating-currentgenerators held in. displaced-phase relation to each other by operativeconnections to a quarter-phase rotary converter.

8. The combination of a direct-current system of distribution, amultiphase rotary converter connected thereto, and single-phasedynamo-electric machines connected to said rotary converter.

9. The combination of a direct-current distribution system, a rotaryconverter of a given numberof phases connected to said distributionsystem, and dynamo-electric ma chines of a different number of phasesconnected to said rotary converter.

In witness whereof I have hereunto set my hand this 28th day of June,1900.

ALEXANDER D. LUNT.

Witnesses p BENJAMIN l5. HULL, MABEL E. JACOBSON.

